Magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit

Abstract

The invention discloses a magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit, and a switch open-circuit fault tolerance system and method of the magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topology circuit. A four-phase full-bridge topology is adopted as a winding topology of a magnetic bearing controller, redundancy design is carried out on a switching device based on the characteristic that winding current in an active magnetic bearing flows in one direction, a normal mode and a fault-tolerant mode are achieved, when the switching device breaks down, a fault switching tube does not participate in current control, a magnetic suspension bearing system is stably controlled by using a redundant switch element, the system can be kept running without shutdown under a fault-tolerant working condition, a rotor is ensured not to fall off, and the fault-tolerant capability of the magnetic suspension bearing system is effectively improved.

Description

technical field [0001] The invention belongs to the field of magnetic suspension bearing control, and more specifically relates to a magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topological circuit, and a magnetic suspension two-degree-of-freedom radial bearing four-phase full-bridge topological circuit fault-tolerant system for switch disconnection faults And a fault-tolerant method for switch opening faults of a four-phase full-bridge topology circuit of a magnetic levitation two-degree-of-freedom radial bearing. Background technique [0002] Magnetic suspension bearing is a bearing device that uses electromagnetic force to levitate the rotor. It can replace traditional mechanical bearings and realize non-contact operation between the rotor and the stator. There is no mechanical contact between the rotor and the stator, and it has the characteristics of no need for lubrication, no friction, and long working life. Magnetic suspension bear...

AI Technical Summary

Problems solved by technology

In the magnetic levitation power amplifier, if the switching device has an open circuit fault, the voltage control of the bridge arm will fail, which will cause the winding current to deviate from the reference value, which will further lead to the instability of the rotor position, resulting in serious failures such as rotor drop and system shutdown.

[0004] However, the existing four-phase four-leg topology applied to maglev power amplifiers reduces the number of devices, but the bridge arms of this topology are unipolar bridge arms, that is, only half of the devices are used in each bridge arm, and the number of devices is not large. Redundancy exists, so fault-tolerant operation is not possible

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